/Engine/Source/Editor/Persona/Public/AnimationEditorViewportClient.h
Draws Mesh Sockets in foreground - bUseSkeletonSocketColor = true for grey (skeleton), false for red (mesh)
static void DrawSockets ( const [UDebugSkelMeshComponent](API\Editor\UnrealEd\Animation\UDebugSkelMeshComponent) * InPreviewMeshComponent, [TArray](API\Runtime\Core\Containers\TArray)< [USkeletalMeshSocket](API\Runtime\Engine\Engine\USkeletalMeshSocket) * > & InSockets, [FSelectedSocketInfo](API\Editor\UnrealEd\Animation\FSelectedSocketInfo) InSelectedSocket, [FPrimitiveDrawInterface](API\Runtime\Engine\FPrimitiveDrawInterface) * PDI, bool bUseSkeletonSocketColor )